Tread-guard for cutter-heads



(No Model.) I 2 Sheets-Sheet 1.

J. L. PACKARD.

' TREAD GUARD FOR CUTTER HEADS. No. 388,578. Patented Aug. 28, 1888.

(No Model I 2 Sheets-Sheet 2.

J. L. PACKARD.

T'RBADVGUAR'D FOR CUTTER HEADS. 8 No. 388,578. Patented Aug; 28, 1888.

NITED STATES JEROME L. PACKARD, OF BOSTON,

ASSIGNOR TO JAMES \V. BROOKS,

TRUSTEE, OF CAMBRIDGE, MASSACHUSETTS.

TREAD-GUARD FOR CUTTER-HEADS.

SPECIFICATION forming part of Letters Patent No. 388,578, dated Angus %8, 1888.

Application filed March 2 1, 1888. Serial No. 268.380.

(No model.)

To aZZ whom it 12mg concern:

Be it known that I, JEROME L. PACKARDflf Boston, county of Suffolk, and State of Massachusetts, have invented an Improvement in Tread-Guards, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

The invention herein contained is designed as an improvement more especially on that kind of trimming-machine employed for boot and shoe work, the cutter employed being of the class known as a rotary, the type of such machine being represented in the so'called Busell machine.

In the class of machine referred to, and es pecially in the Busell machine, the so-called tread-guard or rest is concentric with relation to the shaft for actuating the cutter, and in practice each cutter has to have a treadguard or rest of a size especially adapted to it, and as the blades of the cutter are worn away by use or ground back differenttread-guards or rests have to be used, thus requiring frequent change of tread-guards or rests and necessitating a large number of such guards or rests.

The chief object of my invention is to enable the same treadguard or rest to be used in connection with cutters of different diameters, and this I accomplish by mounting the treadguard or rest in such manner that the support or race on which it rotates at one end of the usual cutter is made adjustable with relation to the axis of rotation of the cutter-carrying shaft, so that the said race or support may be adjusted to occupy a position either concentrio with or more or less eccentric with relation to the center of the shaft for actuating the retary cutter.

To make the proper connection between the cutter-stock and the said guard or rest, in order that thelatter may be actuated by or made to follow the cutter-stock in its rotations,I have provided the cutter-stock with a roller-stud or projection which enters a radial slot in the said guard or rest, the slot being of greater length than the diameter of the said rollerstud or projection, the lost motion of the stud in the slot enabling the said stud to properly engage and rotate the guard or rest, notwithstanding the latter may be supported eccentrically with relation to the axis of rotation of the cutter carrying or driving shaft.

My invention consists,essentially,in the combination, with a rotary cutter and its shaft, of a tread-guard or rest and an independent race or support therefor, made adjustable at right angles to the axis of the rotary cutter,whereby the said guard or rest may be placed in proper working position with relation to the said cuttcr.

My invention also consists in the combination, with the rotary cutter, its shaft, and a tread guard or rest, of a race or support therefor, and a studand-slot connection between the said cntter and guard or rest; also in the combination, with arotary cutter, its shaft, and a tread-guard or rest, of a race or support therefor and means for adjusting the said race or support eccentrically with relation to the said cutter, substantially as will be described.

Other features of my invention will be pointed out in the claims at the end of this specifif cation.

Figure 1 in plan view representsasnfficient portion of a trimming-machine with my invention added to enable my said invention to be understood. Fig. 2 is a front end elevation of the eontrivance shown in Fig. 1, but partially broken out. Fig. 3 is a section of Fig. 1 in the line at, the cutter-stock being omitted. Fi 4 is a section of Fig. 3 in the line as. Fig. 5

is an end view showing the guard or rest adjusted into an eccentric position with relation to the cutter-carrying shaft; Fig. 6, a section of Fig. 5 in the dotted line and Figs. 7 to 10 are modifications to be described-Fig. 7 a section on the line as, Fig. 8 a section on the line a", and Fig. 9 a section on the line as. Fig. 10 is a righthand elevation of the apparatus shown in Fig. 9; and Fig. 11 is a partial sectional detail taken through the raceand the slide E, from which it extends.

The shaft A may be supposed to be that of any usual trimming-machine employed for boot and shoe work, it having at its outer end a reduced portion, as A, upon which will be placed the stock A of any usual cutter, it having blades A of any desired shape, that depending upon the class of work to be done. The shaft A has usual suitable bearings, (not shown,)

one of said bearings having an extended flange or portion, B, to which is secured in suitable manner a sleeve, B, having, as herein shown, suitable lugs or thickened portions, as B (see Fig. 4,) the former receiving through them and holding fixedly suitable guiderods, B upon which slides and may be adjusted the race or support 0, on which is loosely mounted the tread-guard or rest D.

The lug B receives in it the shank a of an adjusting-screw, 0, adapted to be freely rotated,but restrained from longitudinal motion in the said sleeve, the threaded part of the said screw entering a threaded hole in theiear I), forming part of the race or support 0, rotation of the said screw enabling the said race or support to be adjusted to occupy a position more or less eccentric with relation to the center of rotation of the shaft, in order that some one portion of the rand-guard c for a short distance about the periphery of the guard or rest D may coincide with the path of movement of the inner edges of the blades A in their rotation, notwithstanding the eccentricity of the guard or rest D. This point of coincidence may be at the front side the operator holding the shoe stands, the said point being designated by O in Fig. 6, it being immaterial in an operative sense what may be the difference in position between the edge of the rand-guide and the path of movement of the cut-tingedgcs of the blades at the opposite or rear side of thecutter, such divergence being represented in Fig. 6, wherein the guard or rest is adjusted to occupy an eccentric position. (See, also, the line 0 Fig. 5.)

The stock A of the cutter is herein shown as provided with a roller-stud or projection, as d, it entering a radial slot, 01, in the guard or rest, the length of the said slot in excess of the diameter of the roll or stud therein being twice the distance between the concentric position of the race and its position of maximum eccentricity, so that as the said stock is rotated the said roller or other stud in the said slot serves to rotate the said guard or rest about the race or support, the said roll or stud at each rotation of the shaft traversing in the said slot.

If the race for the guard or rest occupies a position concentric with relation to the shaft A, then the roll or stud would stand centrally in the slot (1. In this way one and the same guard or rest, by merely adjusting the independent race or support on which it rotates more or less out of central position with re lation to the center of the shaft A, may be of the cutter, or where able at right angles to the axis seam used with a cutter of any usual diameter, whereas prior to my invention the treadguard or rest has been fixed to and rotated with the cutter, and consequently has had to correspond in size with the size of the cutter being used.

In the modification, Figs. 7 to 10, the race or support 0, made as a ring, is extended from a horizontally-movable slide, E, dovetailed in cross-section, to slide in a correspondinglyshaped groove cut into a bed-plate, E, sup ported on the bracket E forming part of the frame-work containing the bearings for the main shaft A. This slide has connected with it an adjusting screw, 0, which perf'ormsfor it the same function performed by the screw 0 in Figs. 1 to (3viz., it by its rotation ef fecting the adjustment of the race or support for the guard or rest eccentrically with relation to the center of rotation of the shaft A.

Believing myself to be the first to support the tread-guard or rest independently of the cutter-stock, and also to adjust the said guard or rest independently at right angles with relation to the cutter-stock, so as to enable a single guard or rest to be employed with the cutter, being used irrespective of the size within certain limits, I do not desire to limit my invention to the exact construction of mechanism herein shown for effecting the adjustment of the tread-guard or rest.

I clain 1. The combination, with a rotary cutter and its shaft, of a tread-guard or rest and an independent race or support therefor, made adj ustof the rotary cutter, whereby the said guard or rest may be placed in proper working position with relation to the said cutter, substantially as described.

2. The combination, with a rotary cutter, its shaft, and the tread'guard or rest, of a race or support therefor, the stock of the cutter and the guard or rest being connected by a stud and-slot connection, substantially as and for the purpose described.

3. The combination, with a rotary cutter, its shaft, and treadguard or. rest, of the race or support therefor, with means for adjusting the said race or support eccentricall y with relation to the said cutter, substantially as described.

In testimonywhereof I have signed my name to this specification in the presence of two subscribing witnesses.

JEROME L. PACKARD.

\Vitnesses:

BERNIOE J. NoYEs, C. M. CONE. 

